“It’s a very simple equation of United have to pay the player what he feels he deserves and he will extend”

Duncan Castles

Castles, though, claims De Gea is prepared to run down his contract if the club do not pay him what he wants.

“He’s waiting for them to reward him appropriately for what he feels his talents are and what he feels his contribution has been to Manchester United,” he told The Transfer Window podcast.

“So he will be down to the final year in the summer, he’s already made it clear that if they do not give him what he wants he will run his contract down and leave on a free transfer.

“I don’t think he wants to do that, I think he’s quite happy to carry on at Manchester United but he’s not gonna be shortchanged to do so, so it’s a very simple equation of United have to pay the player what he feels he deserves and he will extend, if not they lose him for nothing to the highest bidder.

PSG reportedly want to sign David De Gea (Pic: GETTY)

The Manchester United goalkeeper should be given 'what he feels he deserves', says Castles (Pic: GETTY)

As well as PSG, De Gea has long been linked with a move to Real Madrid.

In August 2015, United thought they had received £29m and Keylor Navas in exchange for De Gea on deadline day.

The deal collapsed, nevertheless, as the paperwork was not submitted before the transfer window closed in Spain.

De Gea was offered to join Real Madrid in 2016, according to Castles (Pic: GETTY)

And Castles claims Los Blancos offered De Gea a way out of Old Trafford again the following year, only for Jose Mourinho to convince him to stay.

“He wants to be the best-paid player at the club, he feels he deserves to be the best-paid player at the club,” he said.

“He did not appreciate that when he was settled after Mourinho came in as manager after Mourinho had convinced him to stay, we should remember in Mourinho’s first summer when he had an option in his contract to leave at a specific price before a set date and turn down the opportunity to go to Madrid that summer, he was not impressed that the club didn’t come and improve his contract at the time when he was ready to sign a new extension to the deal.”